<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <!--true登录 不显示   false未登录 显示-->
    <!--v-if=true显示 false不显示
    isLogin=true 代表登录过
       isLogin=false 代表未登录-->
    <div v-if="isLogin">
        <input type="text" v-model="newName">
        <input type="button" value="添加" @click="arr.push(newName)">
        <a href="javascript:void(0)" @click="isLogin=false">登出</a>
    </div>
    <div v-else>
        <a href="javascript:void(0)">注册</a>
        <!--如果超链接点击时 不离开此页面需要添加javascript:void(0)
        废掉跳转功能-->
        <a href="javascript:void(0)" @click="isLogin=true">登录</a>
    </div>

    <ul>
        <li v-for="name in arr">{{name}}</li>
    </ul>
</div>
<script src="../js/vue.js"></script>
<script>
    let v = new Vue({
        el:"body>div",
        data:{
            arr:["刘备","关羽"],
            isLogin:false,
            newName:""
        }
    })
</script>
</body>
</html>